Hopefully, such deals will also convince countries to build more nuclear power plants or expand existing ones. Europe urgently needs more electricity.
Nuclear power plants are notorious for their long planning, approval and build times (and cost overruns). Then again, I wouldn't want to live near a nuclear power plant built as fast as a data center either...
A lot of reactors in the US are similarly dependent on Russia for uranium enrichment and supplies. Some of that dependency relates to post cold war era treaties (now cancelled because of the strained relationship with Russia) for Russia to decommission its nuclear weaponry and to help Russia economically.
The Loviisa plant actually predates the end of the cold war but Finland at the time was not part of NATO and the relationship with the Soviet Union was very complicated given that they had fought an ugly war in WW II that ended up with the Soviet Union taking a large chunk of Finnish territory. The Loviisa plant ended up built during what is now seen as the definitely very chilly phase of the cold war (under Brezhnev).
And then Finland repeated the mistake with their more recent nuclear additions.